Callaway AEROSPORT BOA 25.5 57(25.5cm) Callaway Aerosport Classic BOA Men's Shoes Callaway Balboa Sport Golf Shoes (For Men) Save 23% callaway AEROSPORT BOA 27.5. Callaway Aerosport Classic BOA Men's Shoes Callaway popular AEROSPORTBOA model has been updated with a new design performance. The upper part is soft and the structure is simple, so it is less likely to hit your feet, giving you a more comfortable fit. The lines on the sides make it a sophisticated accent for an urban style and a smart design that is easy to match with apparel. Comfortable shoe with BOA system for easy on and off and fit. The cushioned rubber outsole improves stability and comfort while walking, making it a great choice for all golfers. Product Details: Upper: Artificial leather Midsole: EVA Outsole: Rubber Spike Type: SLIM LOK